netdev - Re: Big performance loss from 3.4.63 to 3.10.13 when routing ipv4

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Message-ID: <4147596.bk6j0PMJyl@h2o.as.studentenwerk.mhn.de>
Date:	Wed, 23 Oct 2013 17:57:18 +0200
From:	Wolfgang Walter <linux@...m.de>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Steffen Klassert <steffen.klassert@...unet.com>,
	David Miller <davem@...emloft.net>, hannes@...essinduktion.org,
	netdev@...r.kernel.org, klassert@...hematik.tu-chemnitz.de
Subject: Re: Big performance loss from 3.4.63 to 3.10.13 when routing ipv4

Am Mittwoch, 23. Oktober 2013, 05:00:01 schrieb Eric Dumazet:
> On Wed, 2013-10-23 at 13:33 +0200, Wolfgang Walter wrote:
> > I don't know what this value actually means. But on 3.4.x it is much
> > higher. On a machine with 512MB ram it is 32768, on a machine with 1GB
> > ram it is 262144 and with 16GB ram it is 4194304.
> 
> Such huge values should not be needed. We should have at most one dst
> per packet in flight.
> 
> On a loaded router, a NIC not using BQL could queue around 16,000
> packets.
> 
> Of course, Qdisc layers could also store a lot of packets, but using the
> default pfifo_fast is only adding 1000 packets per interface.
> 
> I guess using 65536 as the default value should be safe and reasonable
> 
> Have you tried using 32768 or 65536 ?

I use 32768 on routers with 512MB. They usually have around 50 ipsec-tunnels 
and only about 10 interfaces including vlan-interfaces.

On larger ones I set the bigger values from 3.4.x. That one with 16GB has 
about 2000 ipsec-tunnels. It has about 80 interfaces (inlcuding vlan-
interfaces). Physically it has 8 interfaces with together about 30 hardware- 
queues.

Regards,
-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
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